on 1 of 18 © Macmillan Learning Determine the number of valence electrons for each of the atoms. Enter each answer as a numeral. For example, if an atom has two valence electrons, enter the number 2. Be: > F: Al: Xe:

Reaction of 2.0 L of hydrogen gas with 1.0 L of oxygen gas yields 2.0 L of water vapor. All gases are at the same temperature and pressure. Show how these data support the idea that oxygen gas is a diatomic molecule. Must we consider hydrogen to be a diatomic molecule to explain these results?

7.21 Theoretical models for the structure of atomic nuclei predict the existence of superheavy elements that have not yet been discovered and suggest that such elements might be fairly stable if they could be produced. So researchers are currently trying to synthesize these superheavy elements to test these theories. Element 117 has been synthesized and named Tennessine (Ts). What would the Lewis dot symbol be for this new element?

How many valence electrons are needed to complete the outer valence shell of sulfur? a. 1 b. 2 c. 3 d. 4

A combustion reaction involves the reaction of a substance with oxygen gas. The complete combustion of any hydrocarbon (binary compound of carbon and hydrogen) produces carbon dioxide and water as the only products. Octane is a hydrocarbon that is found in gasoline. Complete combustion of octane produces 8 L of carbon dioxide for every 9 L of water vapor (both measured at the same temperature and pressure). What is the ratio of carbon atoms to hydrogen atoms in a molecule of octane?

2.85 Describe how the saying “opposites attract” corresponds with the mathematical representation of Coulomb’s law shown in Equation 2.1. Remember that attractive forces have negative values and repulsive forces have positive values.

pnc.com/women O Dashboa x Course X O The Wav x E CP grou X M Docume x E 3- Qual X G If you ha Xx course.html?courseld=16985674&OpenVellumHMAC=624ef941a8d 10e711a39b3488025ef9a#10001 v Correct S has 16 electrons. The noble gas that precedes S on the periodic table is neon, so the inner electron configuration is [Nel. Obtain the outer electron configuration by tracing the elements between Ne and S and assigning electrons to the appropriate orbitals. Because S is in row 3, as you trace across the row to S, which is in the third column of the p block, add two 3s electrons and three 3p electrons. As a result, the electron configuration for S is (Ne 3s 3p Part B Se Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For example, He 2s 2p? should be entered as [He]2s^22p^2. Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining Part C P Pearson Copyright © 2021 Pearson Education Inc. All…

How did Thomson determine that the electrons have a negative charge?Drag the terms on the left to the appropriate blanks on the right to complete the sentences.

The first five ionization energies (IE, through IE) of a Period 6 element have the following pattern: IIII IE₁ IE₂ IE3 IE4 IE5 Make a reasonable guess about which element this is. Enter its chemical symbol below. 0 X Ś alo 18 Ar

CHEMISTRY (2021) ASSESSMENT CHEMISTRY I 12-3 (THOMAS WILLIAMS, ID: 12390719) Aluminum has three valence electrons, and oxygen has six valence electrons. What is the formula for aluminum oxide A AlgO3 Al,0 C AIO D Al203 Save B